[V4Rb] VServer and VBlob field

[Charles Yeomans]

On Feb 25, 2006, at 3:44 AM, Ivan Smahin wrote:

> Hello Charles,
>
> Saturday, February 25, 2006, 7:35:08 AM, you wrote:
>
>> On Feb 24, 2006, at 3:57 PM, Ivan Smahin wrote:
>
>>> Hello Charles,
>>>
>>> Friday, February 24, 2006, 7:39:31 PM, you wrote:
>>>
>>>> On Feb 24, 2006, at 7:25 AM, Ruslan Zasukhin wrote:
>>>
>>>>> On 2/24/06 4:47 AM, "Charles Yeomans" <yeomans at desuetude.com> 
>>>>> wrote:
>>>>>
>>>>>> Are there known problems with VBlob fields and cursors and VServer
>>>>>> 2.1?
>>>>>>   I'm seeing some, and I am limited in my debugging by the lack 
>>>>>> of a
>>>>>> working version of VStudio.
>>>>>
>>>>> Can you give more detailed.
>>>>>
>>>>> If look into Mantis I do not see reports about Vserver + BLOB.
>>>
>>>
>>>> Here's the problem I am seeing.  After calling WriteData, I
>>>> immediately
>>>> call ReadData, which returns the string just written.  After calling
>>>> VCursor.Update, I build a new cursor.  Now ReadData returns "" --  
>>>> for
>>>> most records.  For records that had data written to them using V4Rb
>>>> 2.0, WriteData and VCursor.Update does modify the data, but I cannot
>>>> read it later with a cursor generated by a query of the form "SELECT
>>>> recID, * ..."  I can read that data with a query of the form "SELECT
>>>> fieldName..."", though.
>>>
>>>> Furthermore, the VBlob field I created with segment size 128 appears
>>>> to
>>>> actually have segment size 1024 when i look at the field object in 
>>>> the
>>>> debugger.  Also, IsNull = true and IsNullable = true, despite the
>>>> claim
>>>> in the documentation that VBlob fields are not nullable.
>>>
>>>
>>> You  should try 2.2 (last build). Seems the problem you have 
>>> described
>>> is gone away there.
>
>> Unfortunately it remains in 2.2.  In the client-server version, I see
>> the following problem.  I can write to a VBlob field.  If I then
>> retrieve the single record, I can read the Blob contents.  If I
>> retrieve more than one record, then the VBlob field either returns ""
>> from ReadData, or it returns data for the wrong record.  I have 
>> entered
>> it into Mantis.
>
> Ok, could you send me some little project for testing?

Yes, but I will send it probably when I return from a trip late in the 
week.

--------------
Charles Yeomans